These Milward Singer Class 66k Plastic Bobbins are perfect for drop-in sewing machines. There are three bobbins included in the pack, all of which feature a transparent plastic design. These bobbins are suitable for use with Singer sewing machines. Milward has bobbins for both top loading (drop-in) and front loading machines. The range comes in a variety of plastic and metal bobbins for different sewing machines, allowing you to pick the ideal bobbin for your needs. Class 66K, SingerDrop-inThree packTransparent plasticMilward Singer Class 66k Plastic Bobbins 3 Pack